[peter_d]

Looks interesting....

SerpArchive is a free service which daily stores the results of search engine queries indicated by user.
Using this service users are able:
- to track the dynamic changes of the results of search engine queries
- to follow the rating changes of your resources and the resources of your business rivals in real time
- to analyse the changes in rating algorithm of search engines
- to track advertising programmes of Google Adsence
- to track down sites which appear/disappear from SERPs
- to analyse the dynamic changes of Google PR
- to follow the history of changes of Google cache in time